scholarly journals Effects of New Type Lime and Calcium Sulphoaluminate Expansive Agent on Deformation Properties of High Performance Concrete

2015 ◽  
Author(s):  
Anqun Lu ◽  
Wen Xu ◽  
Yujiang Wang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Expansive Agent ◽  
Deformation Properties ◽  
New Type ◽  
Calcium Sulphoaluminate

Influence of CaO-Based Expansive Agent on the Deformation Behavior of High Performance Concrete

2013 ◽  
Vol 438-439 ◽  
pp. 113-116
Author(s):  
Shou Zhi Zhang ◽  
Qian Tian ◽  
An Qun Lu
Keyword(s):  
Deformation Behavior ◽  
High Performance ◽  
High Performance Concrete ◽  
Control Volume ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
Volume Stability ◽  
Expansive Agent ◽  
Effective Expansion ◽  
New Type

In order to improve the volume stability of high performance concrete, the effects of deformation behavior of high performance concrete containing CaO-based expansive agent were investigated. Concrete samples prepared without or with CaO-based expansive agent were compared through expansion under water curing at 20°C, drying shrinkage and autogenous shrinkage measurements. According to the experimental and analytical results, the new type expansive agent can control volume stability for high performance concrete. The addition of 10% CaO-based expansive agent not only built effective expansion in high performance concrete whatever under saturated condition or under sealed condition, but also substantially reduced its drying shrinkage.

scholarly journals Design and Simulation Analysis of a New Type of Assembled UHPC Collision Avoidance

2020 ◽  
Vol 10 (13) ◽  
pp. 4555
Author(s):  
Lingyu Zhou ◽  
Huayong Li ◽  
Jun Wei ◽  
Xingxu Pu ◽  
Akim D. Mahunon ◽  
...  
Keyword(s):  
Collision Avoidance ◽  
High Performance ◽  
High Performance Concrete ◽  
Simulation Analysis ◽  
High Strength ◽  
Ultra High Performance Concrete ◽  
New Type ◽  
Collision Force ◽  
Main Components ◽  
Energy Absorbing

Ship-bridge collisions are one of the most common types of accidents, and bridge anti-ship collision devices are of great importance for bridge protection. First, a new type of assembled ultra-high performance concrete (UHPC) collision avoidance is proposed in this paper. The main components of the device are double-deck, two-way, densely reinforced ultra-high performance concrete floating boxes that are connected by high-strength bolts to form the whole structure and are equipped with steel supporting elements to form a collision energy dissipation device. The device is self-floating in water, is strongly energy absorbing due to plastic deformation, has a high degree of toughness, is corrosion resistant, and so on. This device also benefits from modular manufacturing, efficient installation, and easy replacement of damaged parts. Then, in this paper, the main parameters of the new collision avoidance, such as the material of the internal supporting elements, the wall thickness of the floating box, and the reinforcement ratio of the floating box, are optimized. Finally, a performance analysis and evaluation of the UHPC collision avoidance for the Honghe Bridge in Zhuhai City are carried out by using LS-DYNA program. The numerical results show that the new collision avoidance has significant advantages in reducing the ship–bridge collision force, prolonging the ship–bridge collision time, and protecting the ship. The results show that the assembled UHPC collision avoidance system is very effective for protecting ships and bridges in the event of a ship–bridge collision.

UHPC Footbridge over the Opatovický Canal

2016 ◽  
Vol 249 ◽  
pp. 320-324
Author(s):  
Jan Tichý ◽  
David Čítek ◽  
Jiří Kolísko ◽  
Jan Komanec ◽  
Bohuslav Slánský ◽  
...  
Keyword(s):  
Material Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Material ◽  
Cementitious Material ◽  
Ultra High Performance Concrete ◽  
High Durability ◽  
Design Production ◽  
New Type ◽  
Reliable Design

Article deals with design of footbridge made from ultra high performance concrete (UHPC). UHPC is relatively new type of cementitious material with high compressive strength and high durability. For reliable design of construction from this material an extensive experimental research and verification of material properties are needed. Skanska and Pontex company with cooperation with Klokner institute developed matrix of UHPC used for footbridge construction. Material properties were verified during whole developing and producing process. Footbridge was casted in precast plant Skanska – Steti in December 2014. It was installed over Opatovický canal in October 2015. Contribution describes design, production and installation of footbridge. Material properties of used UHPC are also included.

Study on the Effect of Different Admixtures on the Early Autogenous Shrinkage of High Performance Concrete of Bridge Deck Pavement

2013 ◽  
Vol 857 ◽  
pp. 56-63 ◽  
Author(s):  
Xiang Qian Li ◽  
Bo Tian ◽  
Wei Liu ◽  
She Su
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Bridge Deck ◽  
High Performance Concrete ◽  
Autogenous Shrinkage ◽  
Reducing Agent ◽  
Inhibition Mechanism ◽  
Expansive Agent ◽  
Bridge Deck Pavement ◽  
Shrinkage Reducing Agent

This paper analyzed the mechanism of early autogenous shrinkage of concrete, and studied the influence of early autogenous shrinkage of high performance concrete-(HPC) admixed with different kinds of materials of bridge deck pavement. Four different concrete mixes were used: fiber, fiber plus expansive agent, fiber plus fly ash and fiber plus shrinkage-reducing agent. The result shows that the four different mixes can inhibit the autogenous shrinkage of HPC to a certain extent, the inhibitory effect of different mixes in the order of strong to weak is: fiber plus shrinkage-reducing agent, fiber plus fly ash, fiber plus expansive agent, and fiber itself. Furthermore, the inhibition mechanism of each mix was analyzed and a conclusion of mixture of fiber plus fly ash to be the best choice considered of economic and working performance is drawn as well.

Numerical Simulation of Cohesion Influence of Textile Reinforcement on Bending Performance of Plates Prepared from High Performance Concrete (HPC)

2015 ◽  
Vol 1106 ◽  
pp. 69-72 ◽  
Author(s):  
Tomáš Vlach ◽  
Alexandru Chira ◽  
Lenka Laiblová ◽  
Ctislav Fiala ◽  
Magdaléna Novotná ◽  
...  
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Cover ◽  
Textile Reinforced Concrete ◽  
Significant Saving ◽  
Bending Performance ◽  
Fine Grained ◽  
Technical Textiles ◽  
Fine Grained Structure ◽  
New Type

Demand for very thin concrete elements, which can’t be reinforced with usually used steel reinforcement, gave rise to a new type of non-traditional reinforcement with technical textiles in matrix of epoxy resin. This type of reinforcement together with concrete is called textile reinforced concrete (TRC). Composite reinforcement is very chemically resistant, so the concrete cover is proposed to regard the durability. It allows a significant saving of concrete and design of thinner elements. For TRC structures is used high performance concrete (HPC) with its fine grained structure and high compressive strength. Textile reinforcement and TRC in general are developed at the Faculty of Civil Engineering and the Klokner Institute, CTU in Prague.

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